Add missing files from commit b426e3edde04.

testing/js_embedder_test.h

Index: testing/js_embedder_test.h
diff --git a/testing/js_embedder_test.h b/testing/js_embedder_test.h
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+// Copyright 2015 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef TESTING_JS_EMBEDDER_TEST_H_
+#define TESTING_JS_EMBEDDER_TEST_H_
+
+#include <vector>
+
+#include "fpdfsdk/include/jsapi/fxjs_v8.h"
+#include "testing/embedder_test.h"
+#include "third_party/base/nonstd_unique_ptr.h"
+
+class JSEmbedderTest : public EmbedderTest {
+ public:
+  JSEmbedderTest();
+  ~JSEmbedderTest() override;
+
+  void SetUp() override;
+  void TearDown() override;
+
+  v8::Isolate* isolate();
+  v8::Local<v8::Context> GetV8Context();
+
+ private:
+  nonstd::unique_ptr<FXJS_ArrayBufferAllocator> m_pArrayBufferAllocator;
+  v8::Isolate* m_pIsolate;
+  v8::Global<v8::Context> m_pPersistentContext;
+  std::vector<v8::Global<v8::Object>*> m_StaticObjects;
+};
+
+#endif  // TESTING_JS_EMBEDDER_TEST_H_